How many uses out of holesaw?

[JMurphy97]

I have a holesaw I used once to drill a tank and I'm doing another tank. Is there a limit to how many times you should use one before they become dull?

[Entropy]

There is definately a limit, but it depends on the quality of the bit, how you use it, and what you are using it for. As long as you have a decent bit, drill slowly, and keep it cool (wet the entire time) I would expect at least 20 holes out of a bit. If you use a hi spee drill and let it overheat you might not even get one hole if drilling a thick tank.

[JMurphy97]

I'm not sure if it's cool to type names but it's a glass-holes and I used it once on a 29. Glass is not too thick. I'm drilling a 40 breeder. I went slow when I used it and kept it in water just like the paper said to do.

[Entropy]

You should be fine then. The biggest mistake I have seen is getting impatient and trying to grind through the glass quickly. The same goes from pretty much any drill bit on and material. Heat is a drill bit killer.

[rrasco]

You should get a few holes out of their bits, depending on what size tanks you drill. I have several of them. After I was on my 3rd hole for a 1.5" bulkhead on a 210 (1/2 glass) the bit started wearing a bit thin. I've drilled multiple holes in a 40 with one of their bits, I think I even used it on the 210 for 2 more as well.

When the bit starts to wear you will notice the diamond dust starts to smooth out and there are less particles there to grind down the glass.

[James77]

You will know when they dull, it takes forever to drill a hole when they do. As said, no real rule....how its used matters greatly. I had one of the cheap ones from BulkReefSupply or similar, and I got about 14 or 15 holes before the slowness got to me. That was using water and medium speed with very minimal pressure.

[terancevan88]

Glory hole

Sent from my SAMSUNG-SGH-I727 using Tapatalk 2

[rsg4]

Glory hole

Sent from my SAMSUNG-SGH-I727 using Tapatalk 2

You Jack from the tv show Gold Rush?

[iamwrasseman]

cheap bits from glass holes run fine for the first five or six holes and it falls off pretty fast after that . i would say throw them away after eight or nine holes in 1/4" glass or smaller,maybe six holes for the thicker larger tanks .it really boils down to how much time you want to waist , for the money i cut six holes and then give them away to someone to make them feel "special" !